When the Israelites entered the Promised Land the Amalekites had “tripped them up.” That is, they attacked the Israelites at their weak spot, or at their hindermost part or “tail,” which was comprised of those people who had lagged behind (Deut 25:17).
The Hebrew word for the hindermost part of the body is עָקֵב, which is used in the Hebrew Bible to refer ...
Hosea 12:4 says:
וָיָּ֤שַׂר אֶל־מַלְאָךְ֙ וַיֻּכָ֔ל בָּכָ֖ה וַיִּתְחַנֶּן־ל֑וֹ בֵּֽית־אֵל֙ יִמְצָאֶ֔נּוּ וְשָׁ֖ם יְדַבֵּ֥ר עִמָּֽנוּ׃
He struggled with an angel and prevailed— The other had to weep and implore him. At Bethel [Jacob] would meet him, There to commune with him.
וָיָּ֤שַׂר -- "he struggled" -- is the origin of the word "Israel".